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Grant number: 11/16263-5
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): November 01, 2011
Effective date (End): October 31, 2014
Field of knowledge:Biological Sciences - Botany - Pant Physiology
Principal Investigator:Rafael Vasconcelos Ribeiro
Grantee:Erick Espinoza Nuñez
Home Institution: Instituto Agronômico (IAC). Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil


The earth's climate change will cause drought in many regions, reducing plant productivity and threatening the food security of millions of people. Researches to understand the physiology of plants under water stress will be useful to selection of drought tolerant materials and to guide transgenic plants researches. At the beginning of soil water deficit, plant roots produce signals that induce stomatal closure, which prevent excessive water losses. So, the study of signals is one of the most promising areas in the water-use efficiency in plants. The proposed research aims to evaluate the participation of hydraulic and chemical signals in the drought tolerance of two citrus rootstocks. To this end, two experiments will carry out: first, Valencia sweet orange, Rangpur lime and Swingle citrumelo seedlings will be grown with the root system split between two containers, with approximately half the system in each container. It will allow that half of the root system is expose to dry soil while the remaining half is irrigate. In the second experiment Valencia sweet orange seedlings will be inarching on two rootstocks (Rangpur lime and Swingle citrumelo), so it keeping the water deficit in one rootstock at a time. We will evaluate the water relations, gas exchange, hydraulic conductivity, growth, xylem ABA concentration, xylem pH, sap flow, and aquaporins expression.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARCHIORI, PAULO E. R.; MACHADO, EDUARDO C.; SALES, CRISTINA R. G.; ESPINOZA-NUNEZ, ERICK; MAGALHAES FILHO, JOSE R.; SOUZA, GUSTAVO M.; PIRES, REGINA C. M.; RIBEIRO, RAFAEL V. Physiological Plasticity Is Important for Maintaining Sugarcane Growth under Water Deficit. FRONTIERS IN PLANT SCIENCE, v. 8, DEC 20 2017. Web of Science Citations: 5.

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